Memmert WNB 10, Руководство по эксплуатации, Страница: 5 / 20

BASIC page 5
2.1 Material quality Material quality
Memmert is using stainless steel (Mat.Ref. 1.4301) for the external casing as well as for the interior, an
outstanding material because of its high stability, optimum hygienic features and corrosion resistance
against many (not all!) chemical combinations (Attention e.g. at chlorine combinations!).
The load has to be tested for its chemical compatibility with the materials mentioned above.
A material-compatibility table covering all these materials can be requested from MEMMERT.
WARNING! Always pull out the supply plug before WARNING! Always pull out the supply plug before
opening the bath cover! opening the bath cover!
2.2 Electrical equipment Electrical equipment
• Operating voltage see rating label, 50/60 Hz
• Protection Class 1, i.e. operating isolation with ground connection to EN 61 010
• Protection IP20 to DIN EN 60 529
• Interference suppression to EN55011 Class B
• Bath protected by a fuse 250V/15A fast blow
• Controller protected by a 80 mA fuse (200 mA on 115 V)
• When connecting a MEMMERT bath to the electrical supply you have to observe any local
regulations which apply (e.g. in Germany DIN VDE 0100 with FI protection circuit)
2.3 Note on EMC ( 2.3 Note on EMC (electromagnetic compatibility) electromagnetic compatibility)
This product is intended to operate on a supply network with a system impedance Z
max
at the transfer
point (building connection) of 0.292 Ohm max. The user has to ensure that the product is only operated
on an electrical supply network which meets these requirements. If necessary, details of the system
impedance can be obtained from the local electricity supply authority.
Note:
Any work which involves opening up the bath must only be Any work which involves opening up the bath must only be
carried out by a properly qualifi ed electrician! carried out by a properly qualifi ed electrician!
2.4 Brief technical description Brief technical description
MEMMERT-waterbaths are electrically heated and electronically controlled.
The temperature of the thermostating liquid is continuously controlled by a microprocessor-controller
with pulse package control. Electronic microprocessor-PID-controller with continuous power matching
and autodiagnostic system with fault indicator (see section 12), integral timer for digital programme
time selection.
The temperature is measured using a Pt 100 temperature sensor (4-wire circuit). The accuracy is as
follows:
WNB
Setting accuracy 0,1ºC
Temperature fl uctuation ±0,1ºC
The components of temperature control are controlled by integrated malfunction-recognition. The
heaters are installed outside - therefore no problems through dirt or limeresidue.